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Re: st: mean centering


From   "JVerkuilen (Gmail)" <jvverkuilen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: mean centering
Date   Mon, 21 Jan 2013 15:27:15 -0500

On Mon, Jan 21, 2013 at 1:25 PM, David Hoaglin <dchoaglin@gmail.com> wrote:
> A Householder transformation is actually a reflection.

Ah, right, yes. I might be getting mixed up with Givens rotations or
something else entirely. This isn't part of my normal day-to-day.

What I was trying to say was that the QR decomposition forms a part of
the algorithm for the SVD, so the SVD will end up being much more
costly than the QR decomposition. It's overkill for most problems so
if you don't need it, it's not worth calculating.
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